Heat flow in non-linear form

Hi I’m currently working on mechanical behavior of buffer.
I want to give the heat flow in exponential form(or other non-linear form) but there is only ‘prescribed heat flow rate’ and ‘increment of heat flow’ which I understand it as a linear form
Did I miss something? Or Is there any other way?

Thanks

Hi! You can use the so-called -999 option, introducing the values in a table, as explained in section “Boundary conditions variable with time” (pages 25 and 26 for version 7.4 Nov-2017 of the manual).